Controlability of multi-rotors under motor fault effect

Year 2021, Volume: 4 Issue: 2, 24 - 43, 30.12.2021

Davood Asadi , Karim Ahmadi , Seyed-yaser Nabavi-chashmi Önder Tutsoy

Abstract

The multi-rotor unmanned aerial vehicles (UAVs) are being increasingly applied in both military and civil applications. Motor fault or failure is a common type of fault on multi-rotors, which might take place during mission and operation. Various configurations of fault are considered regarding the desired faulty motor in multi-rotors including the quadcopters and hexarotors. The existence of fault on different motors can lead to different controllability around the vehicle’s body axes. Here, configurations mean the rotation angle of the multi-rotor’s body axes respecting the fault or failure on the arbitrary motor of the multi-rotor. Therefore, it is essential to know which configuration has better reliability in the presence of motor faults or failures. Since the multirotor’s reliability and recoverability is highly related to its controllability, the controllability gramian approach, which is derived from the linear systems theory, as a control objective. The eigenvalues of the controllability gramian can be used as a surrogate for the energy required to control the corresponding eigenvector. Accordingly, the results clearly demonstrate the effect of motor fault on multi-rotor controllability. Additionally, in this paper, configurations with minimum required energy are introduced for quadrotors and hexarotors in different motor faults and failures.

Keywords

Controllability, Motor fault, multi-rotor

Supporting Institution

Scientific and Technological Research Council of Turkey (TÜBİTAK)

Project Number

120M793

Motor hata etkisi altında multikopterlerin kontrol edilebilirliği

Abstract

Multikopter insansız hava araçları (İHA) hem askeri hem de sivil uygulamalarda giderek daha fazla kullanılmaktadır. Motor arızası veya kaybı, görev ve operasyon sırasında meydana gelebilecek multikopterlerde yaygın bir arıza türüdür. Quadcopters ve hexarotors dahil olmak üzere multikopterlerde arızalı motorla ilgili çeşitli arıza konfigürasyonları göz önünde bulundurulur. Farklı motorlarda arıza bulunması, aracın gövde eksenlerinde farklı kontrol edilebilirliklere yol açabilir. Burada konfigürasyonlar, multikopterin keyfi motorundaki arızaya göre multikopterin gövde eksenlerinin dönüş açısı anlamına gelir. Bu nedenle, motor arızalarının varlığında hangi konfigürasyonun daha iyi güvenilirliğe sahip olduğunu bilmek önemlidir. Multikopterin güvenilirliği ve kurtarılabilirliği, kontrol edilebilirliği ile büyük ölçüde ilişkili olduğundan, bir kontrol hedefi olarak doğrusal sistemler teorisinden türetilen kontrol edilebilirlik gramian yaklaşımı. Kontrol edilebilirlik gramianının özdeğerleri, karşılık gelen özvektörü kontrol etmek için gereken enerji için bir vekil olarak kullanılabilir. Buna göre, sonuçlar motor arızasının multikopter kontrol edilebilirliği üzerindeki etkisini açıkça göstermektedir. Ek olarak, bu yazıda, farklı motor arızalarında quadrotor ve hexarotors için minimum gerekli enerjiye sahip konfigürasyonlar tanıtılmaktadır.

Keywords

multikopter, Kontrol edilebilirlik, Motor arızası

Project Number

120M793

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